CN108331948B - Pilot-operated type pipe explosion shutoff valve and control method - Google Patents
Pilot-operated type pipe explosion shutoff valve and control method Download PDFInfo
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- CN108331948B CN108331948B CN201810063997.3A CN201810063997A CN108331948B CN 108331948 B CN108331948 B CN 108331948B CN 201810063997 A CN201810063997 A CN 201810063997A CN 108331948 B CN108331948 B CN 108331948B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0413—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of closure plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention discloses a pilot type pipe explosion shutoff valve and a control method, wherein a main valve is connected with a pilot valve through a connecting pipeline; the pilot valve comprises a pilot valve body, a pilot valve end cover is arranged at the bottom of the pilot valve body, a closed cavity is formed by the pilot valve body and the pilot valve end cover, a pilot valve spring and a pilot valve core are arranged in the closed cavity, an adjusting bolt is arranged at the top end of the pilot valve body, and the bottom end face of the adjusting bolt is in contact fit with the top end of the pilot valve spring; a first pilot valve opening is formed in the side face of the bottom of the pilot valve body, and the first pilot valve opening is communicated with a water outlet side opening of the main valve; the center position of the pilot valve end cover is provided with a pilot valve bottom opening, and the pilot valve bottom opening is communicated with a main valve opening of the main valve; the side wall of the pilot valve body is also provided with a second pilot valve opening and a third pilot valve opening communicated with the atmosphere. The shutoff valve can adapt to normal change of pressure in a pipeline, and the action pressure of the shutoff valve can be adjusted arbitrarily.
Description
Technical Field
The invention relates to a shutoff valve, in particular to a pilot type pipe explosion shutoff valve and a control method.
Background
The large amount of fluid leakage caused by the occurrence of pipe explosion of the pressurized pipeline can cause great loss to the production and life of people along the line. The pilot type pipe explosion shutoff valve controlled by the pilot type pipe explosion shutoff valve can quickly act to be fully closed, the effect caused by the pipe leakage accident is reduced to the minimum, the secondary loss is reduced, and therefore the safety and the economical efficiency of a pipe network are improved.
The pipe explosion shutoff valve is a device capable of rapidly detecting and cutting off fluid delivery after pipe explosion of a pressure pipeline, and is suitable for various water supply pipelines of urban water supply engineering, industrial water supply engineering and the like. The pilot valve controlled pipe explosion shutoff valve does not need electric control, and the valve is closed automatically only by taking the pressure of the pilot valve on the front pipeline and the rear pipeline of the valve as a judging condition, so that the valve is suitable for occasions with large pipe explosion influence, unmanned on duty and high automation degree.
The invention is as follows: 201310301183.6 a burst pipe shutoff valve, discloses a valve for emergently shutting off water flow according to pressure change. When the pipe burst occurs at one end of the water outlet side of the valve, and the pressure behind the valve drops to a certain value, the valve disc is closed under the action of the pre-tightening spring, and the impact force of fluid in the water direction is gradually increased after the valve disc is closed, so that the force born by the valve disc is further increased until the valve is fully closed. The device has the defects that 1, a plurality of spring compression bolts are required to be adjusted simultaneously for adjusting the pressure set value, and the adjustment precision is low; 2. for the pipe explosion shutoff valves with different nominal diameters and different pressure setting values, various springs with different specifications are needed to be selected, the serialization degree of products is low, and the manufacturing cost is high.
Disclosure of Invention
The invention aims to provide a pilot type pipe explosion shutoff valve which can adapt to normal pressure change in a pipeline and can adjust the action pressure of the valve at will.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: the pilot type pipe explosion shutoff valve comprises a main valve, wherein the main valve is connected with a pilot valve through a connecting pipeline;
the pilot valve comprises a pilot valve body, a pilot valve end cover is arranged at the bottom of the pilot valve body, a closed cavity is formed by the pilot valve body and the pilot valve end cover, a pilot valve spring and a pilot valve core are arranged in the closed cavity, an adjusting bolt is arranged at the top end of the pilot valve body, and the bottom end face of the adjusting bolt is in contact fit with the top end of the pilot valve spring;
a first pilot valve opening is formed in the side face of the bottom of the pilot valve body, and the first pilot valve opening is communicated with a water outlet side opening of the main valve;
the center position of the pilot valve end cover is provided with a pilot valve bottom opening, and the pilot valve bottom opening is communicated with a main valve opening of the main valve;
the side wall of the pilot valve body is also provided with a second pilot valve opening and a third pilot valve opening communicated with the atmosphere.
The adjusting bolt is fixed on the guide valve body through a locking nut.
The center of the pilot valve core is provided with a center hole, the center hole is communicated with an annular gap formed by a first sealing ring and a second sealing ring which are arranged on the outer wall of the pilot valve core, the pilot valve core is also provided with a third sealing ring, and the gap between the second sealing ring and the third sealing ring is not communicated with the outside.
The main valve comprises a main valve body, a main valve end cover is arranged at the top of the main valve body, a main valve chamber is formed between the main valve body and the main valve end cover, a valve disc is arranged in the main valve chamber, and the valve disc is matched with a step surface in the main valve body and can intercept liquid flowing through the main valve.
The top of main valve end cover is through bolt fixed mounting has the cylinder body, the inside sliding fit of cylinder body installs the piston, the lower terminal surface fixed mounting of piston has the lower valve rod, the lower valve rod passes main valve end cover, and its other end links to each other with the valve disc is fixed, the top fixed mounting of piston has the upper valve rod, the through-hole that the upper valve rod passed the top of cylinder body.
One end of the upper valve rod, which is positioned outside the cylinder body, is sleeved with a return spring, and the return spring applies downward elasticity to the main valve moving part through the cylinder body and a position limiting part positioned on the upper valve rod.
The return spring is installed outside the cylinder body to apply elastic force to the main valve moving part.
An indication scale is arranged at the top of the cylinder body, is matched with a pointer fixed on the upper valve rod and indicates the opening of the main valve.
The control method of the pilot type pipe explosion shutoff valve, which is characterized in that the opening or closing of the main valve is realized by controlling the control cavity pressure of the main valve through the pilot valve;
in order to realize the working process, the relation among the parameters is as follows:
during normal operation: p1×a1=k1+f1, p1×a2 > k2+f2;
when in emergency closing: p2×a1=k1-f 1, k2 > f2;
wherein: p1 is the minimum water outlet side pressure for keeping the main valve open, P2 is the maximum water outlet side pressure when the main valve is closed, A1 is the effective cross-sectional area of the valve core of the pilot valve, K1 is the pretightening force of the valve spring of the pilot valve, f1 is the friction force between the valve core of the pilot valve and the valve body, A2 is the effective cross-sectional area of the piston, K2 is the pretightening force of the return spring, and f2 is the friction force between the moving part of the main valve, the cylinder body and the end cover of the main valve;
the outlet side pressure section is (P2, ++) when the main valve is kept open, the outlet side pressure section is (0, P1) when the main valve is closed, i.e. the main valve is opened when the pressure is higher than P2 and closed when the pressure is lower than P1.
When the main valve normally supplies water or other liquid, the pressure of the water outlet side is in a section (0, P1), the pressure born by the valve core of the pilot valve is larger than the pretightening force of the valve spring, the valve core of the pilot valve is at the upper dead center, the pressure of the opening of the first pilot valve is equal to the pressure of the lower chamber of the cylinder body and the pressure of the lower chamber of the cylinder body, the pilot valve is in a stable state, and meanwhile, the piston pushes the moving part formed by the upper valve rod, the lower valve rod and the valve disc of the main valve to move downwards under the action of the liquid pressure of the lower chamber of the cylinder body, so that the pretightening force of the return spring is overcome, and the main valve is kept in an open state;
when the pressure of the water outlet side is reduced to the interval (0, P2) after the pipe explosion occurs, the pilot valve core descends and contacts the pilot valve end cover when the pressure applied by the pilot valve core is smaller than the pretightening force of the pilot valve spring, the pilot valve core is positioned at the lower dead center, the annular gap between the first sealing ring and the second sealing ring is communicated with the opening of the second pilot valve, the lower cavity of the cylinder body is communicated with the atmosphere, and the piston pushes the moving part consisting of the upper valve rod, the lower valve rod and the valve disc of the main valve to move downwards under the pretightening force of the reset spring, so that the main valve is closed.
The invention has the following beneficial effects:
1. by adopting the structure, the leakage of the pipe can be automatically detected through the pilot valve after the pipe is detonated, so that the fluid delivery can be rapidly detected and cut off; moreover, the explosion tube shutoff valve controlled by the pilot valve does not need to be electrically controlled, and the valve is automatically closed only by taking the pressure of the pilot valve on the front and rear pipelines of the valve as a judging condition, so that the explosion tube shutoff valve can be suitable for occasions with large explosion tube influence, unmanned operation and high automation degree.
2. The pretightening force of the pilot valve spring can be adjusted by rotating the adjusting bolt.
3. And the return spring is arranged on the axis of the upper valve rod, and downward elastic force is applied to the main valve moving part through the cylinder body and the position limiting part positioned on the upper valve rod.
4. When the pressure born by the valve core of the pilot valve is larger than the pretightening force of the pilot valve spring, the valve core of the pilot valve is at the upper dead center, the pressure of the opening of the first pilot valve is equal to the pressure of the lower cavity of the cylinder body of the main valve, the pilot valve is in a stable state, and meanwhile, the piston of the main valve pushes the moving part formed by the upper valve rod, the lower valve rod and the valve disc of the main valve to move downwards under the action of the liquid pressure of the lower cavity of the cylinder body of the main valve, and the pretightening force of the return spring is overcome, so that the main valve is kept in an open state.
5. When the pressure born by the valve core of the pilot valve is smaller than the pretightening force of the pilot valve spring, the valve core of the pilot valve descends and contacts the end cover of the pilot valve, the pilot valve is positioned at the lower dead center, an annular gap between the first sealing ring and the second sealing ring is communicated with the opening of the second pilot valve, the lower cavity of the cylinder body is further communicated with the atmosphere, and the piston pushes the moving part formed by the upper valve rod, the lower valve rod and the valve disc of the main valve to move downwards under the pretightening force of the return spring, so that the main valve is closed.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.
In the figure: a main valve body 11, a main valve end cover 12, a cylinder 13, an indication scale 14, an upper valve rod 15, a return spring 16, a piston 17, a lower valve rod 18 and a valve disc 19;
the pilot valve comprises a pilot valve body 21, a pilot valve end cover 22, an adjusting bolt 23, a lock nut 24, a pilot valve spring 25, a pilot valve core 26, a first sealing ring 27, a second sealing ring 28 and a third sealing ring 29;
a first pilot valve opening 31, a pilot valve bottom opening 32, a second pilot valve opening 33, a third pilot valve opening 34, a main valve opening 35.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the pilot type pipe explosion shutoff valve comprises a main valve, wherein the main valve is connected with a pilot valve through a connecting pipeline; the pilot valve comprises a pilot valve body 21, a pilot valve end cover 22 is arranged at the bottom of the pilot valve body 21, the pilot valve body 21 and the pilot valve end cover 22 form a closed cavity, a pilot valve spring 25 and a pilot valve core 26 are arranged in the closed cavity, an adjusting bolt 23 is arranged at the top end of the pilot valve body 21, and the bottom end surface of the adjusting bolt 23 is in contact fit with the top end of the pilot valve spring 25; the preload of the pilot valve spring 25 can be adjusted by means of the adjusting screw 23.
Further, a first pilot valve opening hole 31 is formed in the bottom side surface of the pilot valve body 21, and the first pilot valve opening hole 31 is communicated with a water outlet side opening 37 of the main valve; a pilot valve bottom opening 32 is machined in the center position of the pilot valve end cover 22, and the pilot valve bottom opening 32 is communicated with a main valve opening 35 of the main valve; the outlet pressure of the main valve body 11, the bottom pressure of the pilot valve body 21, and the pressure of the cylinder 13 can be equalized by the first pilot valve opening 31.
Further, a second pilot valve opening 33 and a third pilot valve opening 34 are provided on the side wall of the pilot valve body 21, which are in communication with the atmosphere. By means of said second pilot valve opening 33 it is ensured that the pressure of the cylinder 13 is communicated to the atmosphere after the occurrence of a pipe explosion.
Further, the adjusting bolt 23 is fixed to the valve guide body 21 by a lock nut 24.
Further, a center hole is formed in the center of the pilot valve core 26, the center hole is communicated with an annular gap formed by a first sealing ring 27 and a second sealing ring 28 which are arranged on the outer wall of the pilot valve core 26, a third sealing ring 29 is further arranged on the pilot valve core 26, and the gap between the second sealing ring 28 and the third sealing ring 29 is not communicated with the outside.
Further, the main valve includes a main valve body 11, a main valve cover 12 is installed at the top of the main valve body 11, a main valve chamber is formed between the main valve body 11 and the main valve cover 12, a valve disc 19 is installed inside the main valve chamber, and the valve disc 19 is matched with a step surface inside the main valve body 11 and can intercept the liquid flowing through the main valve.
Further, the top of the main valve end cover 12 is fixedly provided with a cylinder body 13 through bolts, the interior of the cylinder body 13 is provided with a piston 17 in a sliding fit manner, the lower end surface of the piston 17 is fixedly provided with a lower valve rod 18, the lower valve rod 18 penetrates through the main valve end cover 12, the other end of the lower valve rod 18 is fixedly connected with a valve disc 19, the top of the piston 17 is fixedly provided with an upper valve rod 15, and the upper valve rod 15 penetrates through a through hole at the top of the cylinder body 13.
Further, a return spring 16 is sleeved at one end of the upper valve rod 15 outside and inside the cylinder 13, and the return spring 16 applies downward elastic force to the main valve moving part through the cylinder 13 and a position limiting part positioned on the upper valve rod 15.
Further, an indication scale 14 is mounted on the top of the cylinder 13, and the indication scale 14 is matched with a pointer fixed on the upper valve rod 15 and indicates the opening of the main valve.
Example 2:
as shown in fig. 2, in the present embodiment, the structure of the main valve is the same as that in embodiment 1, and in the present embodiment, the structure of the center hole of the pilot valve is different from that in embodiment 1, in the present embodiment, the center hole is located at the center of the pilot valve core 26, and the center hole is communicated with the annular gap formed by the first seal ring 27 and the second seal ring 28 through the transverse through hole communicated with the center hole.
Example 3:
as shown in fig. 3, in the present embodiment, the main valve has the same structure as in embodiment 1, and the return spring 16 is installed outside the cylinder 13 in the present embodiment, thereby applying elastic force to the main valve moving member.
Example 4:
the control method of the pilot type pipe explosion shutoff valve, which is characterized in that the opening or closing of the main valve is realized by controlling the control cavity pressure of the main valve through the pilot valve;
in order to realize the working process, the relation among the parameters is as follows:
during normal operation: p1×a1=k1+f1, p1×a2 > k2+f2;
when in emergency closing: p2×a1=k1-f 1, k2 > f2;
wherein: p1 is the minimum water outlet side pressure for keeping the main valve open, P2 is the maximum water outlet side pressure when the main valve is closed, A1 is the effective cross-sectional area of the valve core of the pilot valve, K1 is the pretightening force of the valve spring of the pilot valve, f1 is the friction force between the valve core of the pilot valve and the valve body, A2 is the effective cross-sectional area of the piston, K2 is the pretightening force of the return spring, and f2 is the friction force between the moving part of the main valve, the cylinder body and the end cover of the main valve;
the outlet side pressure section is (P2, ++) when the main valve is kept open, the outlet side pressure section is (0, P1) when the main valve is closed, i.e. the main valve is opened when the pressure is higher than P2 and closed when the pressure is lower than P1.
When the main valve normally supplies water or other liquid, the pressure of the outlet water side is in a section (0, P1), the pressure born by the pilot valve core 26 is larger than the pretightening force of the pilot valve spring 25, the pilot valve core 26 is at the upper dead center, the pressure of the first pilot valve opening hole 31 is equal to the pressure of the lower chamber of the cylinder body 21 and the pressure of the lower chamber of the cylinder body 13, the pilot valve is in a stable state, and meanwhile, the piston 17 pushes the moving part formed by the upper valve rod 15, the lower valve rod 18 and the valve disc 19 of the main valve to move downwards under the action of the liquid pressure of the lower chamber of the cylinder body 13 so as to overcome the pretightening force of the return spring 16, and thus the main valve is kept in an open state;
when the pressure of the outlet water side is reduced to the interval (0, P2) after the pipe explosion occurs, when the pressure applied by the pilot valve core 26 is smaller than the pretightening force of the pilot valve spring 25, the pilot valve core 26 descends and contacts the pilot valve end cover 22 to be at the lower dead point, the annular gap between the first sealing ring 27 and the second sealing ring 28 is communicated with the second pilot valve opening 33, the lower chamber of the cylinder body 13 is further communicated with the atmosphere, and the piston 17 pushes the moving part consisting of the upper valve rod 15, the lower valve rod 18 and the valve disc 19 of the main valve to move downwards under the pretightening force of the return spring 16, so that the main valve is closed.
The working process and working principle of the invention are as follows:
further, the pretightening force of the pilot valve spring 25 can be adjusted by rotating the adjusting bolt 23, and the minimum water outlet side pressure P1 of the main valve opening and the maximum water outlet side pressure P2 of the main valve closing can be changed;
further, the non-adjustable range of the valve closing pressure setting is located in the interval (P1-P2), the difference P2-P1 of which depends only on the friction force f1 between the pilot valve core and the pilot valve body, and reducing this friction force can achieve that the valve closing pressure setting is located in a larger range.
Further, in order to realize the principle, only the pretightening force of the main valve return spring 16 is ensured to be larger than the friction force f2 of the main valve moving part, and the effective cross section area A2 of the piston 19 is only required to be enlarged.
The above-described embodiments are intended to illustrate the present invention, not to limit it, and any modifications and variations made thereto are within the spirit of the invention and the scope of the appended claims.
Claims (4)
1. The utility model provides a guide's blasting tube shutoff valve, it includes main valve, its characterized in that: the main valve is connected with the pilot valve through a connecting pipeline;
the pilot valve comprises a pilot valve body (21), a pilot valve end cover (22) is arranged at the bottom of the pilot valve body (21), the pilot valve body (21) and the pilot valve end cover (22) form a closed cavity, a pilot valve spring (25) and a pilot valve core (26) are arranged in the closed cavity, an adjusting bolt (23) is arranged at the top end of the pilot valve body (21), and the bottom end surface of the adjusting bolt (23) is in contact fit with the top end of the pilot valve spring (25);
a first pilot valve opening (31) is formed in the side face of the bottom of the pilot valve body (21), and the first pilot valve opening (31) is communicated with a water outlet side opening (37) of the main valve;
the center position of the pilot valve end cover (22) is provided with a pilot valve bottom opening (32), and the pilot valve bottom opening (32) is communicated with a main valve opening (35) of the main valve;
a second pilot valve opening (33) and a third pilot valve opening (34) which are communicated with the atmosphere are also arranged on the side wall of the pilot valve body (21);
the center of the pilot valve core (26) is provided with a center hole, the center hole is communicated with an annular gap formed by a first sealing ring (27) and a second sealing ring (28) which are arranged on the outer wall of the pilot valve core (26), the pilot valve core (26) is also provided with a third sealing ring (29), and the gap between the second sealing ring (28) and the third sealing ring (29) is not communicated with the outside;
the main valve comprises a main valve body (11), a main valve end cover (12) is arranged at the top of the main valve body (11), a main valve chamber is formed between the main valve body (11) and the main valve end cover (12), a valve disc (19) is arranged in the main valve chamber, and the valve disc (19) is matched with a step surface in the main valve body (11) and can intercept liquid flowing through the main valve;
the top of the main valve end cover (12) is fixedly provided with a cylinder body (13) through a bolt, the inside of the cylinder body (13) is provided with a piston (17) in a sliding fit manner, the lower end surface of the piston (17) is fixedly provided with a lower valve rod (18), the lower valve rod (18) penetrates through the main valve end cover (12), the other tail end of the lower valve rod (18) is fixedly connected with a valve disc (19), the top of the piston (17) is fixedly provided with an upper valve rod (15), and the upper valve rod (15) penetrates through a through hole at the top of the cylinder body (13);
one end of the upper valve rod (15) outside and positioned in the cylinder body (13) is sleeved with a return spring (16), and the return spring (16) applies downward elasticity to the main valve moving part through the cylinder body (13) and a position limiting part positioned on the upper valve rod (15);
the control cavity pressure of the main valve is controlled by the pilot valve to realize the opening or closing of the main valve;
to achieve the opening or closing of the main valve, the relation between the parameters is:
during normal operation: p1×a1=k1+f1, p1×a2 > k2+f2;
when in emergency closing: p2×a1=k1-f 1, k2 > f2;
wherein: p1 is the minimum water outlet side pressure for keeping the main valve open, P2 is the maximum water outlet side pressure when the main valve is closed, A1 is the effective cross-sectional area of the valve core of the pilot valve, K1 is the pretightening force of the valve spring of the pilot valve, f1 is the friction force between the valve core of the pilot valve and the valve body, A2 is the effective cross-sectional area of the piston, K2 is the pretightening force of the return spring, and f2 is the friction force between the moving part of the main valve, the cylinder body and the end cover of the main valve;
the pressure section of the water outlet side is (P1, ++) when the main valve is kept open, the pressure section of the water outlet side is (0, P2) when the main valve is closed, the main valve is opened when the pressure is larger than P1, and the main valve is closed when the pressure is smaller than P2.
2. The pilot-operated squib shutoff valve of claim 1, wherein: the adjusting bolt (23) is fixed on the guide valve body (21) through a locking nut (24).
3. The pilot-operated squib shutoff valve of claim 1, wherein: the return spring (16) is arranged outside the cylinder body (13) and applies elastic force to the main valve moving part.
4. The pilot-operated squib shutoff valve of claim 1, wherein: an indicating scale (14) is arranged at the top of the cylinder body (13), and the indicating scale (14) is matched with a pointer fixed on an upper valve rod (15) and indicates the opening degree of the main valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810063997.3A CN108331948B (en) | 2018-01-23 | 2018-01-23 | Pilot-operated type pipe explosion shutoff valve and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810063997.3A CN108331948B (en) | 2018-01-23 | 2018-01-23 | Pilot-operated type pipe explosion shutoff valve and control method |
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| Publication Number | Publication Date |
|---|---|
| CN108331948A CN108331948A (en) | 2018-07-27 |
| CN108331948B true CN108331948B (en) | 2023-05-16 |
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| CN201810063997.3A Active CN108331948B (en) | 2018-01-23 | 2018-01-23 | Pilot-operated type pipe explosion shutoff valve and control method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110645389B (en) * | 2019-01-15 | 2021-02-12 | 温州市简弈科技有限公司 | Pilot operated safety valve |
| CN110394034B (en) * | 2019-07-02 | 2022-07-26 | 珠海市思卡净化技术有限公司 | Compressed air purifier and emission control method thereof |
| CN112594421B (en) * | 2020-12-30 | 2022-07-08 | 海盐沃企机电设备有限公司 | Pilot valve structure of pilot operated safety valve |
| CN113179734B (en) * | 2021-05-26 | 2022-08-02 | 广西壮族自治区农业科学院 | Irrigation device for annona squamosa planting |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078836U (en) * | 1990-09-15 | 1991-06-12 | 大连理工大学 | Leading safety valve for pressure containers |
| US5735308A (en) * | 1993-09-02 | 1998-04-07 | Kabushiki Kaisha Yokota Seisakusho | Automatic constant-pressure regulating lift device |
| WO2001029430A1 (en) * | 1999-10-20 | 2001-04-26 | Hitachi Construction Machinery Co., Ltd. | Pipe breakage control valve device |
| CN101520104A (en) * | 2008-09-10 | 2009-09-02 | 兰州理工大学 | Pipeline emergency cut-off valve |
| CN202674424U (en) * | 2012-07-23 | 2013-01-16 | 开维喜阀门集团有限公司 | Self-closing valve for pipe burst |
| CN103542138A (en) * | 2013-11-01 | 2014-01-29 | 深圳市华力大机电技术有限公司 | Airbag type ventilation and drainage positive and negative pressure water hammer control valve group |
| CN208041249U (en) * | 2018-01-23 | 2018-11-02 | 中国长江电力股份有限公司 | Pilot-operated type booster shutoff valve |
-
2018
- 2018-01-23 CN CN201810063997.3A patent/CN108331948B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078836U (en) * | 1990-09-15 | 1991-06-12 | 大连理工大学 | Leading safety valve for pressure containers |
| US5735308A (en) * | 1993-09-02 | 1998-04-07 | Kabushiki Kaisha Yokota Seisakusho | Automatic constant-pressure regulating lift device |
| WO2001029430A1 (en) * | 1999-10-20 | 2001-04-26 | Hitachi Construction Machinery Co., Ltd. | Pipe breakage control valve device |
| CN101520104A (en) * | 2008-09-10 | 2009-09-02 | 兰州理工大学 | Pipeline emergency cut-off valve |
| CN202674424U (en) * | 2012-07-23 | 2013-01-16 | 开维喜阀门集团有限公司 | Self-closing valve for pipe burst |
| CN103542138A (en) * | 2013-11-01 | 2014-01-29 | 深圳市华力大机电技术有限公司 | Airbag type ventilation and drainage positive and negative pressure water hammer control valve group |
| CN208041249U (en) * | 2018-01-23 | 2018-11-02 | 中国长江电力股份有限公司 | Pilot-operated type booster shutoff valve |
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| CN108331948A (en) | 2018-07-27 |
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